Asymmetrical Channel Feedback in Coordinated Transmission Links
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Solution Overview
Problem
In MIMO communication systems, the volume of feedback data from mobile terminals to base stations consumes significant uplink bandwidth, degrading system capacity and performance.
Innovation Solution
The method involves calculating and transmitting feedback data for different communication channels with varying data sizes, based on specific criteria such as feedback parameters, quantization levels, spectral resolutions, and update rates, allowing for asymmetrical feedback to optimize data accuracy and reduce bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback data for all communication channels is transmitted with uniform high accuracy, then channel measurement precision is improved, but uplink bandwidth consumption increases
Solution Approach 1:
The patent applies local quality by transmitting feedback data with different data sizes for different communication channels. Specifically, feedback data for the first communication channel (serving cell) is transmitted with a first data size, while feedback data for the second communication channel (interfering cell) is transmitted with a second data size that is smaller than the first. This allows the system to allocate higher precision feedback where it is most needed (serving channel) and reduce precision where less accuracy is required (interfering channels), thereby reducing overall uplink bandwidth consumption while maintaining essential measurement precision.
Solution Approach 2:
The patent implements asymmetry by treating different communication channels differently in terms of feedback data transmission. The feedback data for the serving cell and interfering cells are not transmitted uniformly but with asymmetric data sizes. This asymmetric approach recognizes that the serving channel requires higher feedback accuracy for optimal performance while interfering channels can tolerate lower accuracy, thus creating an asymmetric feedback strategy that optimizes the trade-off between measurement precision and bandwidth consumption.
2Productivity
If feedback data size is increased for all channels, then system performance is improved, but uplink bandwidth availability is reduced
Solution Approach 1:
The patent applies local quality by differentiating feedback data sizes based on the specific communication channel. Feedback data for the serving cell is transmitted with a larger data size to maintain high system performance for the primary connection, while feedback data for interfering cells is transmitted with a smaller data size. This localized differentiation ensures that system performance is maintained where it matters most without unnecessarily consuming uplink bandwidth on all channels.
Solution Approach 2:
The patent applies partial action by providing high-precision feedback data only for the serving cell rather than for all cells equally. This partial approach to feedback transmission maintains sufficient system performance for the primary communication link while avoiding the excessive bandwidth consumption that would result from transmitting full-precision feedback for all communication channels.
Data Source
AI summary
A method includes, in a mobile communication terminal, receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals. First and second feedback data, which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size. The first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations.